Performances of Co-W/-Al2O3 Catalysts on Hydrotreatment of Light Gas Oil Derived from Athabasca Bitumen

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• 作者：Santosh K. Vishwakarma ; V. Sundaramurthy ; Ajay K. Dalai ; John Adjaye
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：July 4, 2007
• 年：2007
• 卷：46
• 期：14
• 页码：4778 - 4786
• 全文大小：153K
• 年卷期：v.46,no.14(July 4, 2007)
• ISSN：1520-5045

文摘

-Al₂O₃-supported Co-W-based catalysts with varying cobalt (1-3 wt %) and tungsten (7-13 wt %) loadingswere prepared using impregnation and sonochemical methods. Brunauer-Emmett-Teller (BET) analysisindicated that the sonochemical method of preparation resulted a larger reduction in surface area of the -Al₂O₃support than the impregnation method for all the prepared catalysts. X-ray photoelectron spectroscopy (XPS)showed that most of tungsten metal segregated on the support surface of sonochemically prepared catalysts,whereas catalysts prepared via the impregnation method showed uniform metal dispersion on the support.The performances of all the synthesized catalysts were tested at a pressure of 8.9 MPa, a liquid hourly spacevelocity (LHSV) of 2 h^-1, and temperatures of 340, 350, and 360 C in a trickle-bed microreactor for thehydrodesulfurization (HDS) and hydrodenitrogenation (HDN) of light gas oil (LGO) derived from Athabascabitumen. The initial screening tests indicated that an impregnated catalyst with 3 wt % cobalt and 10 wt %tungsten and a sonochemical catalyst with 3 wt % cobalt and 13 wt % tungsten are the most active catalystsfor the HDN and HDS of LGO. These two catalysts were selected for detail performance, optimization, andkinetic studies. The effects of reaction temperature (340-380 C), pressure (7.6-10.3 MPa), LHSV (1.5-2.0 h^-1), and H₂/gas oil ratio (400-800 mL/mL) were examined in the HDS and HDN of LGO with thesecatalysts. The impregnated catalyst showed higher nitrogen and sulfur conversion than the sonochemicalcatalyst under all reaction conditions. The reaction kinetics for HDS was best-fitted with a power-law model,whereas the same for HDN was determined to be best represented by a Langmuir-Hinshelwood model witha reasonable accuracy (0.90 <R² <0.95).